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Spun bond method



Introduction

Industrial textiles are produced in order to be applicable in industry. In designing such textiles aesthetics features are considered as well. They are not only industrial, but also unique and beautiful. 40% of whole production of textile industry are contributed to them. It seems that industrial textiles will experience a higher growth compared to other products in future. Nonwoven fabrics have individual design, wide application, and appropriate price. Such features leads to their use in different fields from domestic, textile and medical to industrial area. Their structure are like clothes, however they are not produced by weaving or knitting textile fibers. They are made by various treatments through fibers to fabric without weaving, so they are called nonwoven fabrics. Although such productions have a long history and felt is the first product of nonwoven fabrics, nowadays what which is called nonwoven fabrics and has a remarkable role in modern life, is the result of high technology in various fields especially in artificial fiber. Nonwoven fabrics are the production of new technologies and new industry to satisfy modern needs.

Nonwoven fabrics

Nonwoven fabrics are sheet or web structures bonded together by entangling fiber or filaments mechanically, chemically or thermally. They are flat or tufted porous sheets that are made directly from separate fibers, molten plastic or plastic films. They produce a tight and coherent network.

History

Generally spun bond industry has a long history and goes back to felt production period. Felt is a nonwoven textile which is the product of high technology. Spun bonding process was attempted to be commercialized through 1940's and 1950's. The spun bond process was patented by Slather and Thomas of Corning Company for the production of glass wool. In 1945, Callender patented similar spun bond processes for the production of mineral wool. Spun bonded nonwovens made of synthetic polymers were commercialized by the technology of Freudenberg(Germany) and Du pont(USA) in the 1950's and 1960's. After that, various spun bond processing technologies such as polypropylene (PP) has good chemical resistance and hydrophobicity, and excellent electrical insulation properties and it is one of the important polymers for nonwoven s. it is to be noted that nowadays 70% of its production is done in North America and west Europe.

Spun bond method

Melt polymere is cooled in chambers after extruding from spinneret and production of continuous filaments. The filaments are traversed dynamically. Chilled filaments form a spun bonded layer on their way to conveyers belt.